Engineering Materials Practice Set-8

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1. The hardness of steel increases if it contains

Austenite

Cementite

Martensite

Pearlite

2. Melting point of iron is

1539°C

1489°C

1712°C

1601°C

3. The crystal structure of brass is

H.C.P.

F.C.C.

Orthorhombic crystalline structure

B.C.C.

4. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Copper, nickel and antimony

Nickel, copper and zinc

Iron, zinc and bismuth

5. Connecting rod is usually made of

High carbon steel

Low carbon steel

Aluminium

Medium carbon steel

6. Sulphur in cast iron

Make the iron white and hard

Increases hardness and brittleness

Aids fusibility and fluidity

Makes the iron soft and easily machinable

7. Hardness of upper bainite (acicular structure) is about

RC 65

RC 48

RC 57

RC 80

8. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Mild steel

Stainless steel

9. Argentite is the principal ore or raw material for

Tin

Zinc

Aluminium

Silver

10. High carbon steel carries carbon percentage

0.3 to 0.6%

0.6 to 0.8%

0.8 to 1.5%

0.1 to 0.3%

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11. Which of the following is used for bearing liner?

Bell metal

Babbitt metal

Gun metal

Bronze

12. Tungsten in high speed steel provides

Hot hardness

Sharp cutting edge

Toughness

Wear resistance

13. Bronze contains

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

70 - 75% copper and rest tin

14. Cold rolled steel sheets contain carbon of the following order

0.2%

0.1%

0.4%

0.6%

15. Cupola produces following material

Cast iron

Wrought iron

Pig iron

Malleable iron

16. An example of amorphous material is

Lead

Zinc

Glass

Silver

17. Manganese in steel increases its

Tensile strength

Fluidity

Hardness

Ductility

18. The hardness is the property of a material due to which it

Breaks with little permanent distortion

Can be drawn into wires

Can cut another metal

Can be rolled or hammered into thin sheets

19. Steel made from phosphate iron is

Tough

Hard

Ductile

Brittle

20. Carbon in iron is an example of

Intermetallic compounds

Interstitial solid solution

Substitutional solution

All of the above

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21. The alloying element which reduces the formation of iron sulphide in steel is

Nickel

Manganese

Chromium

Vanadium

22. Shock resisting steels should have

Toughness

Low tensile strength

Low hardness

Low wear resistance

23. Chromium in steel

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Gives ductility, toughness, tensile strength and anti-corrosion properties

24. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Aluminium and zinc

Tungsten and sulphur

Chromium and nickel

25. Compressive strength of grey cast iron in tonnes/cm is of the order of

1015

710

35

57

26. Which is false statement about tempering? Tempering is done to

Improve ductility

Release stresses

Improve machinability

Improve toughness

27. Gun metal contains

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70 - 78% copper and rest tin

70% copper and 30% zinc

28. Aluminium bronze contains aluminium and copper in the ratio of

60 : 40

10 : 90

40 : 60

50 : 50

29. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Sulphur, graphite and aluminium

Phosphorous and aluminium

30. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

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31. Phosphor bronze contains

None of the above

1% phosphorous

0.5% of phosphorous

2.5% phosphorous

32. The presence of sulphur in pig iron makes

It hard

It brittle

The casting unsound

It easily machinable

33. Free cutting steels

Contain carbon in free form

Do not exist

Require least cutting force

Are used where ease in machining is the criterion

34. Delta metal is an alloy of

Iron, aluminium and magnesium

Copper, zinc and iron

Iron, lead and tin

Iron, nickel and copper

35. Which of the following is the binding material in cemented carbides?

Iron

Vanadium

Nickel

Cobalt

36. Permalloy is a

Kind of stainless steel

Polymer

Nickel and iron alloy having high permeability

None ferrous alloy

37. The alloy used for making electrical resistances and heating elements is

Invar

Magnin

Elinvar

Nichrome

38. Preheating is essential in welding

All nonferrous materials

High speed steel

All of the above

Cast iron

39. Beryllium bronze has

(C) Both (A) and (B)

(B) High fatigue limit

(A) High yield point

(D) None of these

40. Nimonic contains __________ percentage of nickel as that of Inconel.

More

Same

Less

None of these

Engineering Materials Practice Set-8

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